Can somebody tell me what is the instance value and block value in the Dxdesigner?

Can somebody tell me what is the instance value and block value in the Dxdesigner? I am not very sure about this. When a symbol was put in the schematic, it will have a instance value. The block value is for the bolck in the hierarchical design. But in the DxDesigner for PADs 9.2 a symbol have the instance value and block value at the same time. But this is not the hierarchical design. Can somebody help me on this problem?Thanks in advance.